This stone is called Mên-an-Tol, ("holed stone"
in the Cornish language). It is located on the moors north of Madron, in
Cornwall, England.

It has the reputation of curing and invigorating people
who pass through it.

There are countless stone sites, holy wells, and earthworks
worth visiting all over the world. Many have the reputation for healing.
All have a powerful and significant presence.

A bit more about Mên-an-Tol:

The Mên-an-Tol monument consists of four stones: one fallen, two
uprights and between these a circular one, 1.3m (4ft 6in) in diameter, pierced
by a hole that occupies about half its size. An old plan of Mên-an-Tol
shows that originally the three main stones stood in a triangle, which makes
certain astroarchaeological claims for it difficult to support. They could
be the remains of a Neolithic tomb, because holed stones have been found
acting as entrances into burial chambers. Its age in uncertain but it is
usually assigned to the Bronze Age, between 3000-4000 years ago. Holed stones
are found in many parts of British Isles as well as in other countries of
the world and together with holy wells they have retained the ideas and
customs associated with them more tenaciously than any other type of ancient
sites. Beliefs connected with them are remarkably similar from the Orkneys
to the far west of Cornwall. Traditional rituals at Mên-an-Tol (centuries
ago known also as Devil's Eye) involved passing naked children three times
through the holed stone and then drawing them along the grass three times
in an easterly direction. This was thought to cure scrofula (a form of tuberculosis)
and rickets. Adults seeking relief from rheumatism, spine troubles or ague
were advised to crawl through the hole nine times against the sun. The holed
stone also had prophetic qualities and, according to nineteenth-century
folklorist Robert Hunt: If two brass pins are carefully laid across each
other on the top edge of the stone, any question put to the rock will be
answered by the pins acquiring, through some unknown agency, a peculiar
motion.